Insert Caption Causing Word To Lock Up

Hello,

I'm currently having some trouble with captions in a word 2007 *.docx
document. I have about 15 tables and 15 figures in my document and I'm
inserting captions for both of them. However, once I get past about 6
captions total, including tables and figures, Word just locks up. On
the 7th caption, I can bring up the insert caption dialog box and type
about 25 characters before Word locks up. I've disabled all add-ins
and that helped a little. As an absolute last resort, I'll number my
captions manually, but I would really like the caption feature to
work.

Any help would be greatly appreciated.

Thanks,

Mike